/mandos/trunk : revision 355

9

* "browse_callback", and parts of "main".

10

*

11

* Everything else is

12

13

12

13

14

*

15

* This program is free software: you can redistribute it and/or

16

* modify it under the terms of the GNU General Public License as

43

stdout, ferror(), remove() */

44

#include <stdint.h> /* uint16_t, uint32_t */

45

#include <stddef.h> /* NULL, size_t, ssize_t */

46

#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),

47

strtof(), abort() */

46

#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,

47

srand(), strtof() */

48

#include <stdbool.h> /* bool, false, true */

49

#include <string.h> /* memset(), strcmp(), strlen(),

50

strerror(), asprintf(), strcpy() */

63

strtoimax() */

64

#include <assert.h> /* assert() */

65

#include <errno.h> /* perror(), errno */

66

#include <time.h> /* nanosleep(), time(), sleep() */

66

#include <time.h> /* nanosleep(), time() */

67

#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,

68

SIOCSIFFLAGS, if_indextoname(),

69

if_nametoindex(), IF_NAMESIZE */

71

INET_ADDRSTRLEN, INET6_ADDRSTRLEN

72

*/

73

#include <unistd.h> /* close(), SEEK_SET, off_t, write(),

74

getuid(), getgid(), seteuid(),

75

setgid(), pause() */

76

#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */

74

getuid(), getgid(), setuid(),

75

setgid() */

76

#include <arpa/inet.h> /* inet_pton(), htons */

77

#include <iso646.h> /* not, or, and */

78

#include <argp.h> /* struct argp_option, error_t, struct

79

argp_state, struct argp,

82

#include <signal.h> /* sigemptyset(), sigaddset(),

83

sigaction(), SIGTERM, sig_atomic_t,

84

raise() */

85

#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,

86

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

87

85

88

86

#ifdef __linux__

89

87

#include <sys/klog.h> /* klogctl() */

127

125

static const char mandos_protocol_version[] = "1";

128

126

const char *argp_program_version = "mandos-client " VERSION;

129

127

const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";

130

static const char sys_class_net[] = "/sys/class/net";

131

char *connect_to = NULL;

132

128

133

129

/* Used for passing in values through the Avahi callback functions */

134

130

typedef struct {

146

142

.dh_bits = 1024, .priority = "SECURE256"

147

143

":!CTYPE-X.509:+CTYPE-OPENPGP" };

148

144

149

sig_atomic_t quit_now = 0;

150

int signal_received = 0;

151

152

145

/*

153

146

* Make additional room in "buffer" for at least BUFFER_SIZE more

154

147

* bytes. "buffer_capacity" is how much is currently allocated,

171

164

*/

172

165

static bool init_gpgme(const char *seckey,

173

166

const char *pubkey, const char *tempdir){

167

int ret;

174

168

gpgme_error_t rc;

175

169

gpgme_engine_info_t engine_info;

176

170

179

173

* Helper function to insert pub and seckey to the engine keyring.

180

174

*/

181

175

bool import_key(const char *filename){

182

int ret;

183

176

int fd;

184

177

gpgme_data_t pgp_data;

185

178

423

416

}

424

417

425

418

/* OpenPGP credentials */

426

ret = gnutls_certificate_allocate_credentials(&mc.cred);

419

gnutls_certificate_allocate_credentials(&mc.cred);

427

420

if(ret != GNUTLS_E_SUCCESS){

428

fprintf(stderr, "GnuTLS memory error: %s\n",

421

fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning

422

from

423

-Wunreachable-code

424

*/

429

425

safer_gnutls_strerror(ret));

430

426

gnutls_global_deinit();

431

427

return -1;

478

474

static int init_gnutls_session(gnutls_session_t *session){

479

475

int ret;

480

476

/* GnuTLS session creation */

481

do {

482

ret = gnutls_init(session, GNUTLS_SERVER);

483

if(quit_now){

484

return -1;

485

}

486

} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);

477

ret = gnutls_init(session, GNUTLS_SERVER);

487

478

if(ret != GNUTLS_E_SUCCESS){

488

479

fprintf(stderr, "Error in GnuTLS session initialization: %s\n",

489

480

safer_gnutls_strerror(ret));

491

482

492

483

{

493

484

const char *err;

494

do {

495

ret = gnutls_priority_set_direct(*session, mc.priority, &err);

496

if(quit_now){

497

gnutls_deinit(*session);

498

return -1;

499

}

500

} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);

485

ret = gnutls_priority_set_direct(*session, mc.priority, &err);

501

486

if(ret != GNUTLS_E_SUCCESS){

502

487

fprintf(stderr, "Syntax error at: %s\n", err);

503

488

fprintf(stderr, "GnuTLS error: %s\n",

507

492

}

508

493

}

509

494

510

do {

511

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

512

mc.cred);

513

if(quit_now){

514

gnutls_deinit(*session);

515

return -1;

516

}

517

} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);

495

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

496

mc.cred);

518

497

if(ret != GNUTLS_E_SUCCESS){

519

498

fprintf(stderr, "Error setting GnuTLS credentials: %s\n",

520

499

safer_gnutls_strerror(ret));

523

502

}

524

503

525

504

/* ignore client certificate if any. */

526

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

505

gnutls_certificate_server_set_request(*session,

506

GNUTLS_CERT_IGNORE);

527

507

528

508

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

529

509

534

514

static void empty_log(__attribute__((unused)) AvahiLogLevel level,

535

515

__attribute__((unused)) const char *txt){}

536

516

517

sig_atomic_t quit_now = 0;

518

int signal_received = 0;

519

537

520

/* Called when a Mandos server is found */

538

521

static int start_mandos_communication(const char *ip, uint16_t port,

539

522

AvahiIfIndex if_index,

540

523

int af){

541

int ret, tcp_sd = -1;

524

int ret, tcp_sd;

542

525

ssize_t sret;

543

526

union {

544

527

struct sockaddr_in in;

545

528

struct sockaddr_in6 in6;

546

529

} to;

547

530

char *buffer = NULL;

548

char *decrypted_buffer = NULL;

531

char *decrypted_buffer;

549

532

size_t buffer_length = 0;

550

533

size_t buffer_capacity = 0;

534

ssize_t decrypted_buffer_size;

551

535

size_t written;

552

int retval = -1;

536

int retval = 0;

553

537

gnutls_session_t session;

554

538

int pf; /* Protocol family */

555

539

556

errno = 0;

557

558

if(quit_now){

559

errno = EINTR;

560

return -1;

561

}

562

563

540

switch(af){

564

541

case AF_INET6:

565

542

pf = PF_INET6;

569

546

break;

570

547

default:

571

548

fprintf(stderr, "Bad address family: %d\n", af);

572

errno = EINVAL;

573

549

return -1;

574

550

}

575

551

585

561

586

562

tcp_sd = socket(pf, SOCK_STREAM, 0);

587

563

if(tcp_sd < 0){

588

int e = errno;

589

564

perror("socket");

590

errno = e;

591

goto mandos_end;

592

}

593

594

if(quit_now){

595

errno = EINTR;

596

goto mandos_end;

565

return -1;

597

566

}

598

567

599

568

memset(&to, 0, sizeof(to));

605

574

ret = inet_pton(af, ip, &to.in.sin_addr);

606

575

}

607

576

if(ret < 0 ){

608

int e = errno;

609

577

perror("inet_pton");

610

errno = e;

611

goto mandos_end;

578

return -1;

612

579

}

613

580

if(ret == 0){

614

int e = errno;

615

581

fprintf(stderr, "Bad address: %s\n", ip);

616

errno = e;

617

goto mandos_end;

582

return -1;

618

583

}

619

584

if(af == AF_INET6){

620

585

to.in6.sin6_port = htons(port); /* Spurious warnings from

627

592

if(if_index == AVAHI_IF_UNSPEC){

628

593

fprintf(stderr, "An IPv6 link-local address is incomplete"

629

594

" without a network interface\n");

630

errno = EINVAL;

631

goto mandos_end;

595

return -1;

632

596

}

633

597

/* Set the network interface number as scope */

634

598

to.in6.sin6_scope_id = (uint32_t)if_index;

639

603

-Wunreachable-code */

640

604

}

641

605

642

if(quit_now){

643

errno = EINTR;

644

goto mandos_end;

645

}

646

647

606

if(debug){

648

607

if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){

649

608

char interface[IF_NAMESIZE];

676

635

}

677

636

}

678

637

679

if(quit_now){

680

errno = EINTR;

681

goto mandos_end;

682

}

683

684

638

if(af == AF_INET6){

685

639

ret = connect(tcp_sd, &to.in6, sizeof(to));

686

640

} else {

687

641

ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */

688

642

}

689

643

if(ret < 0){

690

if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){

691

int e = errno;

692

perror("connect");

693

errno = e;

694

}

695

goto mandos_end;

696

}

697

698

if(quit_now){

699

errno = EINTR;

700

goto mandos_end;

644

perror("connect");

645

return -1;

701

646

}

702

647

703

648

const char *out = mandos_protocol_version;

707

652

ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,

708

653

out_size - written));

709

654

if(ret == -1){

710

int e = errno;

711

655

perror("write");

712

errno = e;

656

retval = -1;

713

657

goto mandos_end;

714

658

}

715

659

written += (size_t)ret;

723

667

break;

724

668

}

725

669

}

726

727

if(quit_now){

728

errno = EINTR;

729

goto mandos_end;

730

}

731

670

}

732

671

733

672

if(debug){

734

673

fprintf(stderr, "Establishing TLS session with %s\n", ip);

735

674

}

736

675

737

if(quit_now){

738

errno = EINTR;

739

goto mandos_end;

740

}

741

742

676

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

743

677

744

if(quit_now){

745

errno = EINTR;

746

goto mandos_end;

747

}

748

749

do {

678

do{

750

679

ret = gnutls_handshake(session);

751

if(quit_now){

752

errno = EINTR;

753

goto mandos_end;

754

}

755

680

} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);

756

681

757

682

if(ret != GNUTLS_E_SUCCESS){

759

684

fprintf(stderr, "*** GnuTLS Handshake failed ***\n");

760

685

gnutls_perror(ret);

761

686

}

762

errno = EPROTO;

687

retval = -1;

763

688

goto mandos_end;

764

689

}

765

690

771

696

}

772

697

773

698

while(true){

774

775

if(quit_now){

776

errno = EINTR;

777

goto mandos_end;

778

}

779

780

699

buffer_capacity = incbuffer(&buffer, buffer_length,

781

700

buffer_capacity);

782

701

if(buffer_capacity == 0){

783

int e = errno;

784

702

perror("incbuffer");

785

errno = e;

786

goto mandos_end;

787

}

788

789

if(quit_now){

790

errno = EINTR;

703

retval = -1;

791

704

goto mandos_end;

792

705

}

793

706

802

715

case GNUTLS_E_AGAIN:

803

716

break;

804

717

case GNUTLS_E_REHANDSHAKE:

805

do {

718

do{

806

719

ret = gnutls_handshake(session);

807

808

if(quit_now){

809

errno = EINTR;

810

goto mandos_end;

811

}

812

720

} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);

813

721

if(ret < 0){

814

722

fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");

815

723

gnutls_perror(ret);

816

errno = EPROTO;

724

retval = -1;

817

725

goto mandos_end;

818

726

}

819

727

break;

820

728

default:

821

729

fprintf(stderr, "Unknown error while reading data from"

822

730

" encrypted session with Mandos server\n");

731

retval = -1;

823

732

gnutls_bye(session, GNUTLS_SHUT_RDWR);

824

errno = EIO;

825

733

goto mandos_end;

826

734

}

827

735

} else {

833

741

fprintf(stderr, "Closing TLS session\n");

834

742

}

835

743

836

if(quit_now){

837

errno = EINTR;

838

goto mandos_end;

839

}

840

841

do {

842

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

843

if(quit_now){

844

errno = EINTR;

845

goto mandos_end;

846

}

847

} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);

744

gnutls_bye(session, GNUTLS_SHUT_RDWR);

848

745

849

746

if(buffer_length > 0){

850

ssize_t decrypted_buffer_size;

851

747

decrypted_buffer_size = pgp_packet_decrypt(buffer,

852

748

buffer_length,

853

749

&decrypted_buffer);

854

750

if(decrypted_buffer_size >= 0){

855

856

751

written = 0;

857

752

while(written < (size_t) decrypted_buffer_size){

858

if(quit_now){

859

errno = EINTR;

860

goto mandos_end;

861

}

862

863

753

ret = (int)fwrite(decrypted_buffer + written, 1,

864

754

(size_t)decrypted_buffer_size - written,

865

755

stdout);

866

756

if(ret == 0 and ferror(stdout)){

867

int e = errno;

868

757

if(debug){

869

758

fprintf(stderr, "Error writing encrypted data: %s\n",

870

759

strerror(errno));

871

760

}

872

errno = e;

873

goto mandos_end;

761

retval = -1;

762

break;

874

763

}

875

764

written += (size_t)ret;

876

765

}

877

retval = 0;

766

free(decrypted_buffer);

767

} else {

768

retval = -1;

878

769

}

770

} else {

771

retval = -1;

879

772

}

880

773

881

774

/* Shutdown procedure */

882

775

883

776

mandos_end:

884

{

885

int e = errno;

886

free(decrypted_buffer);

887

free(buffer);

888

if(tcp_sd >= 0){

889

ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));

890

}

891

if(ret == -1){

892

if(e == 0){

893

e = errno;

894

}

895

perror("close");

896

}

897

gnutls_deinit(session);

898

if(quit_now){

899

e = EINTR;

900

retval = -1;

901

}

902

errno = e;

777

free(buffer);

778

ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));

779

if(ret == -1){

780

perror("close");

903

781

}

782

gnutls_deinit(session);

904

783

return retval;

905

784

}

906

785

969

848

/* Called whenever a new services becomes available on the LAN or

970

849

is removed from the LAN */

971

850

972

if(quit_now){

973

return;

974

}

975

976

851

switch(event){

977

852

default:

978

853

case AVAHI_BROWSER_FAILURE:

1021

896

errno = old_errno;

1022

897

}

1023

898

1024

/*

1025

* This function determines if a directory entry in /sys/class/net

1026

* corresponds to an acceptable network device.

1027

* (This function is passed to scandir(3) as a filter function.)

1028

*/

1029

int good_interface(const struct dirent *if_entry){

1030

ssize_t ssret;

1031

char *flagname = NULL;

1032

if(if_entry->d_name[0] == '.'){

1033

return 0;

1034

}

1035

int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,

1036

if_entry->d_name);

1037

if(ret < 0){

1038

perror("asprintf");

1039

return 0;

1040

}

1041

int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));

1042

if(flags_fd == -1){

1043

perror("open");

1044

free(flagname);

1045

return 0;

1046

}

1047

free(flagname);

1048

typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */

1049

/* read line from flags_fd */

1050

ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */

1051

char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */

1052

flagstring[(size_t)to_read] = '\0';

1053

if(flagstring == NULL){

1054

perror("malloc");

1055

close(flags_fd);

1056

return 0;

1057

}

1058

while(to_read > 0){

1059

ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,

1060

(size_t)to_read));

1061

if(ssret == -1){

1062

perror("read");

1063

free(flagstring);

1064

close(flags_fd);

1065

return 0;

1066

}

1067

to_read -= ssret;

1068

if(ssret == 0){

1069

break;

1070

}

1071

}

1072

close(flags_fd);

1073

intmax_t tmpmax;

1074

char *tmp;

1075

errno = 0;

1076

tmpmax = strtoimax(flagstring, &tmp, 0);

1077

if(errno != 0 or tmp == flagstring or (*tmp != '\0'

1078

and not (isspace(*tmp)))

1079

or tmpmax != (ifreq_flags)tmpmax){

1080

if(debug){

1081

fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",

1082

flagstring, if_entry->d_name);

1083

}

1084

free(flagstring);

1085

return 0;

1086

}

1087

free(flagstring);

1088

ifreq_flags flags = (ifreq_flags)tmpmax;

1089

/* Reject the loopback device */

1090

if(flags & IFF_LOOPBACK){

1091

if(debug){

1092

fprintf(stderr, "Rejecting loopback interface \"%s\"\n",

1093

if_entry->d_name);

1094

}

1095

return 0;

1096

}

1097

/* Accept point-to-point devices only if connect_to is specified */

1098

if(connect_to != NULL and (flags & IFF_POINTOPOINT)){

1099

if(debug){

1100

fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",

1101

if_entry->d_name);

1102

}

1103

return 1;

1104

}

1105

/* Otherwise, reject non-broadcast-capable devices */

1106

if(not (flags & IFF_BROADCAST)){

1107

if(debug){

1108

fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",

1109

if_entry->d_name);

1110

}

1111

return 0;

1112

}

1113

/* Reject non-ARP interfaces (including dummy interfaces) */

1114

if(flags & IFF_NOARP){

1115

if(debug){

1116

fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",

1117

if_entry->d_name);

1118

}

1119

return 0;

1120

}

1121

/* Accept this device */

1122

if(debug){

1123

fprintf(stderr, "Interface \"%s\" is acceptable\n",

1124

if_entry->d_name);

1125

}

1126

return 1;

1127

}

1128

1129

899

int main(int argc, char *argv[]){

1130

900

AvahiSServiceBrowser *sb = NULL;

1131

901

int error;

1133

903

intmax_t tmpmax;

1134

904

char *tmp;

1135

905

int exitcode = EXIT_SUCCESS;

1136

const char *interface = "";

906

const char *interface = "eth0";

1137

907

struct ifreq network;

1138

908

int sd = -1;

1139

909

bool take_down_interface = false;

1140

910

uid_t uid;

1141

911

gid_t gid;

912

char *connect_to = NULL;

1142

913

char tempdir[] = "/tmp/mandosXXXXXX";

1143

914

bool tempdir_created = false;

1144

915

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1149

920

bool gpgme_initialized = false;

1150

921

float delay = 2.5f;

1151

922

1152

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

923

struct sigaction old_sigterm_action;

1153

924

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1154

925

1155

uid = getuid();

1156

gid = getgid();

1157

1158

/* Lower any group privileges we might have, just to be safe */

1159

errno = 0;

1160

ret = setgid(gid);

1161

if(ret == -1){

1162

perror("setgid");

1163

}

1164

1165

/* Lower user privileges (temporarily) */

1166

errno = 0;

1167

ret = seteuid(uid);

1168

if(ret == -1){

1169

perror("seteuid");

1170

}

1171

1172

if(quit_now){

1173

goto end;

1174

}

1175

1176

926

{

1177

927

struct argp_option options[] = {

1178

928

{ .name = "debug", .key = 128,

1207

957

.arg = "SECONDS",

1208

958

.doc = "Maximum delay to wait for interface startup",

1209

959

.group = 2 },

1210

/*

1211

* These reproduce what we would get without ARGP_NO_HELP

1212

*/

1213

{ .name = "help", .key = '?',

1214

.doc = "Give this help list", .group = -1 },

1215

{ .name = "usage", .key = -3,

1216

.doc = "Give a short usage message", .group = -1 },

1217

{ .name = "version", .key = 'V',

1218

.doc = "Print program version", .group = -1 },

1219

960

{ .name = NULL }

1220

961

};

1221

962

1222

963

error_t parse_opt(int key, char *arg,

1223

964

struct argp_state *state){

1224

errno = 0;

1225

965

switch(key){

1226

966

case 128: /* --debug */

1227

967

debug = true;

1243

983

tmpmax = strtoimax(arg, &tmp, 10);

1244

984

if(errno != 0 or tmp == arg or *tmp != '\0'

1245

985

or tmpmax != (typeof(mc.dh_bits))tmpmax){

1246

argp_error(state, "Bad number of DH bits");

986

fprintf(stderr, "Bad number of DH bits\n");

987

exit(EXIT_FAILURE);

1247

988

}

1248

989

mc.dh_bits = (typeof(mc.dh_bits))tmpmax;

1249

990

break;

1254

995

errno = 0;

1255

996

delay = strtof(arg, &tmp);

1256

997

if(errno != 0 or tmp == arg or *tmp != '\0'){

1257

argp_error(state, "Bad delay");

998

fprintf(stderr, "Bad delay\n");

999

exit(EXIT_FAILURE);

1258

1000

}

1259

1001

break;

1260

/*

1261

* These reproduce what we would get without ARGP_NO_HELP

1262

*/

1263

case '?': /* --help */

1264

argp_state_help(state, state->out_stream,

1265

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1266

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1267

case -3: /* --usage */

1268

argp_state_help(state, state->out_stream,

1269

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1270

case 'V': /* --version */

1271

fprintf(state->out_stream, "%s\n", argp_program_version);

1272

exit(argp_err_exit_status);

1002

case ARGP_KEY_ARG:

1003

argp_usage(state);

1004

case ARGP_KEY_END:

1273

1005

break;

1274

1006

default:

1275

1007

return ARGP_ERR_UNKNOWN;

1276

1008

}

1277

return errno;

1009

return 0;

1278

1010

}

1279

1011

1280

1012

struct argp argp = { .options = options, .parser = parse_opt,

1281

1013

.args_doc = "",

1282

1014

.doc = "Mandos client -- Get and decrypt"

1283

1015

" passwords from a Mandos server" };

1284

ret = argp_parse(&argp, argc, argv,

1285

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1286

switch(ret){

1287

case 0:

1288

break;

1289

case ENOMEM:

1290

default:

1291

errno = ret;

1292

perror("argp_parse");

1293

exitcode = EX_OSERR;

1294

goto end;

1295

case EINVAL:

1296

exitcode = EX_USAGE;

1016

ret = argp_parse(&argp, argc, argv, 0, 0, NULL);

1017

if(ret == ARGP_ERR_UNKNOWN){

1018

fprintf(stderr, "Unknown error while parsing arguments\n");

1019

exitcode = EXIT_FAILURE;

1297

1020

goto end;

1298

1021

}

1299

1022

}

1301

1024

if(not debug){

1302

1025

avahi_set_log_function(empty_log);

1303

1026

}

1304

1305

if(interface[0] == '\0'){

1306

struct dirent **direntries;

1307

ret = scandir(sys_class_net, &direntries, good_interface,

1308

alphasort);

1309

if(ret >= 1){

1310

/* Pick the first good interface */

1311

interface = strdup(direntries[0]->d_name);

1312

if(debug){

1313

fprintf(stderr, "Using interface \"%s\"\n", interface);

1314

}

1315

if(interface == NULL){

1316

perror("malloc");

1317

free(direntries);

1318

exitcode = EXIT_FAILURE;

1319

goto end;

1320

}

1321

free(direntries);

1322

} else {

1323

free(direntries);

1324

fprintf(stderr, "Could not find a network interface\n");

1325

exitcode = EXIT_FAILURE;

1326

goto end;

1327

}

1328

}

1329

1027

1330

1028

/* Initialize Avahi early so avahi_simple_poll_quit() can be called

1331

1029

from the signal handler */

1334

1032

mc.simple_poll = avahi_simple_poll_new();

1335

1033

if(mc.simple_poll == NULL){

1336

1034

fprintf(stderr, "Avahi: Failed to create simple poll object.\n");

1337

exitcode = EX_UNAVAILABLE;

1035

exitcode = EXIT_FAILURE;

1338

1036

goto end;

1339

1037

}

1340

1038

1342

1040

ret = sigaddset(&sigterm_action.sa_mask, SIGINT);

1343

1041

if(ret == -1){

1344

1042

perror("sigaddset");

1345

exitcode = EX_OSERR;

1043

exitcode = EXIT_FAILURE;

1346

1044

goto end;

1347

1045

}

1348

1046

ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);

1349

1047

if(ret == -1){

1350

1048

perror("sigaddset");

1351

exitcode = EX_OSERR;

1049

exitcode = EXIT_FAILURE;

1352

1050

goto end;

1353

1051

}

1354

1052

ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);

1355

1053

if(ret == -1){

1356

1054

perror("sigaddset");

1357

exitcode = EX_OSERR;

1358

goto end;

1359

}

1360

/* Need to check if the handler is SIG_IGN before handling:

1361

| [[info:libc:Initial Signal Actions]] |

1362

| [[info:libc:Basic Signal Handling]] |

1363

*/

1364

ret = sigaction(SIGINT, NULL, &old_sigterm_action);

1365

if(ret == -1){

1366

perror("sigaction");

1367

return EX_OSERR;

1368

}

1369

if(old_sigterm_action.sa_handler != SIG_IGN){

1370

ret = sigaction(SIGINT, &sigterm_action, NULL);

1371

if(ret == -1){

1372

perror("sigaction");

1373

exitcode = EX_OSERR;

1374

goto end;

1375

}

1376

}

1377

ret = sigaction(SIGHUP, NULL, &old_sigterm_action);

1378

if(ret == -1){

1379

perror("sigaction");

1380

return EX_OSERR;

1381

}

1382

if(old_sigterm_action.sa_handler != SIG_IGN){

1383

ret = sigaction(SIGHUP, &sigterm_action, NULL);

1384

if(ret == -1){

1385

perror("sigaction");

1386

exitcode = EX_OSERR;

1387

goto end;

1388

}

1389

}

1390

ret = sigaction(SIGTERM, NULL, &old_sigterm_action);

1391

if(ret == -1){

1392

perror("sigaction");

1393

return EX_OSERR;

1394

}

1395

if(old_sigterm_action.sa_handler != SIG_IGN){

1396

ret = sigaction(SIGTERM, &sigterm_action, NULL);

1397

if(ret == -1){

1398

perror("sigaction");

1399

exitcode = EX_OSERR;

1400

goto end;

1401

}

1055

exitcode = EXIT_FAILURE;

1056

goto end;

1057

}

1058

ret = sigaction(SIGINT, &sigterm_action, &old_sigterm_action);

1059

if(ret == -1){

1060

perror("sigaction");

1061

exitcode = EXIT_FAILURE;

1062

goto end;

1063

}

1064

ret = sigaction(SIGHUP, &sigterm_action, NULL);

1065

if(ret == -1){

1066

perror("sigaction");

1067

exitcode = EXIT_FAILURE;

1068

goto end;

1069

}

1070

ret = sigaction(SIGTERM, &sigterm_action, NULL);

1071

if(ret == -1){

1072

perror("sigaction");

1073

exitcode = EXIT_FAILURE;

1074

goto end;

1402

1075

}

1403

1076

1404

1077

/* If the interface is down, bring it up */

1405

if(strcmp(interface, "none") != 0){

1078

if(interface[0] != '\0'){

1406

1079

if_index = (AvahiIfIndex) if_nametoindex(interface);

1407

1080

if(if_index == 0){

1408

1081

fprintf(stderr, "No such interface: \"%s\"\n", interface);

1409

exitcode = EX_UNAVAILABLE;

1082

exitcode = EXIT_FAILURE;

1410

1083

goto end;

1411

1084

}

1412

1085

1414

1087

goto end;

1415

1088

}

1416

1089

1417

/* Re-raise priviliges */

1418

errno = 0;

1419

ret = seteuid(0);

1420

if(ret == -1){

1421

perror("seteuid");

1422

}

1423

1424

1090

#ifdef __linux__

1425

1091

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1426

messages about the network interface to mess up the prompt */

1092

messages to mess up the prompt */

1427

1093

ret = klogctl(8, NULL, 5);

1428

1094

bool restore_loglevel = true;

1429

1095

if(ret == -1){

1435

1101

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1436

1102

if(sd < 0){

1437

1103

perror("socket");

1438

exitcode = EX_OSERR;

1104

exitcode = EXIT_FAILURE;

1439

1105

#ifdef __linux__

1440

1106

if(restore_loglevel){

1441

1107

ret = klogctl(7, NULL, 0);

1444

1110

}

1445

1111

}

1446

1112

#endif /* __linux__ */

1447

/* Lower privileges */

1448

errno = 0;

1449

ret = seteuid(uid);

1450

if(ret == -1){

1451

perror("seteuid");

1452

}

1453

1113

goto end;

1454

1114

}

1455

1115

strcpy(network.ifr_name, interface);

1464

1124

}

1465

1125

}

1466

1126

#endif /* __linux__ */

1467

exitcode = EX_OSERR;

1468

/* Lower privileges */

1469

errno = 0;

1470

ret = seteuid(uid);

1471

if(ret == -1){

1472

perror("seteuid");

1473

}

1127

exitcode = EXIT_FAILURE;

1474

1128

goto end;

1475

1129

}

1476

1130

if((network.ifr_flags & IFF_UP) == 0){

1479

1133

ret = ioctl(sd, SIOCSIFFLAGS, &network);

1480

1134

if(ret == -1){

1481

1135

take_down_interface = false;

1482

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1483

exitcode = EX_OSERR;

1136

perror("ioctl SIOCSIFFLAGS");

1137

exitcode = EXIT_FAILURE;

1484

1138

#ifdef __linux__

1485

1139

if(restore_loglevel){

1486

1140

ret = klogctl(7, NULL, 0);

1489

1143

}

1490

1144

}

1491

1145

#endif /* __linux__ */

1492

/* Lower privileges */

1493

errno = 0;

1494

ret = seteuid(uid);

1495

if(ret == -1){

1496

perror("seteuid");

1497

}

1498

1146

goto end;

1499

1147

}

1500

1148

}

1528

1176

}

1529

1177

}

1530

1178

#endif /* __linux__ */

1531

/* Lower privileges */

1532

errno = 0;

1533

if(take_down_interface){

1534

/* Lower privileges */

1535

ret = seteuid(uid);

1536

if(ret == -1){

1537

perror("seteuid");

1538

}

1539

} else {

1540

/* Lower privileges permanently */

1541

ret = setuid(uid);

1542

if(ret == -1){

1543

perror("setuid");

1544

}

1545

}

1179

}

1180

1181

if(quit_now){

1182

goto end;

1183

}

1184

1185

uid = getuid();

1186

gid = getgid();

1187

1188

errno = 0;

1189

setgid(gid);

1190

if(ret == -1){

1191

perror("setgid");

1192

}

1193

1194

ret = setuid(uid);

1195

if(ret == -1){

1196

perror("setuid");

1546

1197

}

1547

1198

1548

1199

if(quit_now){

1552

1203

ret = init_gnutls_global(pubkey, seckey);

1553

1204

if(ret == -1){

1554

1205

fprintf(stderr, "init_gnutls_global failed\n");

1555

exitcode = EX_UNAVAILABLE;

1206

exitcode = EXIT_FAILURE;

1556

1207

goto end;

1557

1208

} else {

1558

1209

gnutls_initialized = true;

1575

1226

1576

1227

if(not init_gpgme(pubkey, seckey, tempdir)){

1577

1228

fprintf(stderr, "init_gpgme failed\n");

1578

exitcode = EX_UNAVAILABLE;

1229

exitcode = EXIT_FAILURE;

1579

1230

goto end;

1580

1231

} else {

1581

1232

gpgme_initialized = true;

1591

1242

char *address = strrchr(connect_to, ':');

1592

1243

if(address == NULL){

1593

1244

fprintf(stderr, "No colon in address\n");

1594

exitcode = EX_USAGE;

1245

exitcode = EXIT_FAILURE;

1595

1246

goto end;

1596

1247

}

1597

1248

1605

1256

if(errno != 0 or tmp == address+1 or *tmp != '\0'

1606

1257

or tmpmax != (uint16_t)tmpmax){

1607

1258

fprintf(stderr, "Bad port number\n");

1608

exitcode = EX_USAGE;

1259

exitcode = EXIT_FAILURE;

1609

1260

goto end;

1610

1261

}

1611

1262

1627

1278

if(quit_now){

1628

1279

goto end;

1629

1280

}

1630

1631

while(not quit_now){

1632

ret = start_mandos_communication(address, port, if_index, af);

1633

if(quit_now or ret == 0){

1634

break;

1635

}

1636

sleep(15);

1637

};

1638

1639

if (not quit_now){

1281

1282

ret = start_mandos_communication(address, port, if_index, af);

1283

if(ret < 0){

1284

exitcode = EXIT_FAILURE;

1285

} else {

1640

1286

exitcode = EXIT_SUCCESS;

1641

1287

}

1642

1643

1288

goto end;

1644

1289

}

1645

1290

1669

1314

if(mc.server == NULL){

1670

1315

fprintf(stderr, "Failed to create Avahi server: %s\n",

1671

1316

avahi_strerror(error));

1672

exitcode = EX_UNAVAILABLE;

1317

exitcode = EXIT_FAILURE;

1673

1318

goto end;

1674

1319

}

1675

1320

1684

1329

if(sb == NULL){

1685

1330

fprintf(stderr, "Failed to create service browser: %s\n",

1686

1331

avahi_strerror(avahi_server_errno(mc.server)));

1687

exitcode = EX_UNAVAILABLE;

1332

exitcode = EXIT_FAILURE;

1688

1333

goto end;

1689

1334

}

1690

1335

1728

1373

1729

1374

/* Take down the network interface */

1730

1375

if(take_down_interface){

1731

/* Re-raise priviliges */

1732

errno = 0;

1733

ret = seteuid(0);

1376

ret = ioctl(sd, SIOCGIFFLAGS, &network);

1734

1377

if(ret == -1){

1735

perror("seteuid");

1378

perror("ioctl SIOCGIFFLAGS");

1379

} else if(network.ifr_flags & IFF_UP) {

1380

network.ifr_flags &= ~IFF_UP; /* clear flag */

1381

ret = ioctl(sd, SIOCSIFFLAGS, &network);

1382

if(ret == -1){

1383

perror("ioctl SIOCSIFFLAGS");

1384

}

1736

1385

}

1737

if(geteuid() == 0){

1738

ret = ioctl(sd, SIOCGIFFLAGS, &network);

1739

if(ret == -1){

1740

perror("ioctl SIOCGIFFLAGS");

1741

} else if(network.ifr_flags & IFF_UP) {

1742

network.ifr_flags &= ~(short)IFF_UP; /* clear flag */

1743

ret = ioctl(sd, SIOCSIFFLAGS, &network);

1744

if(ret == -1){

1745

perror("ioctl SIOCSIFFLAGS -IFF_UP");

1746

}

1747

}

1748

ret = (int)TEMP_FAILURE_RETRY(close(sd));

1749

if(ret == -1){

1750

perror("close");

1751

}

1752

/* Lower privileges permanently */

1753

errno = 0;

1754

ret = setuid(uid);

1755

if(ret == -1){

1756

perror("setuid");

1757

}

1386

ret = (int)TEMP_FAILURE_RETRY(close(sd));

1387

if(ret == -1){

1388

perror("close");

1758

1389

}

1759

1390

}

1760

1391

1803

1434

}

1804

1435

1805

1436

if(quit_now){

1806

sigemptyset(&old_sigterm_action.sa_mask);

1807

old_sigterm_action.sa_handler = SIG_DFL;

1808

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

1809

&old_sigterm_action,

1810

NULL));

1437

ret = sigaction(signal_received, &old_sigterm_action, NULL);

1811

1438

if(ret == -1){

1812

1439

perror("sigaction");

1813

1440

}

1814

do {

1815

ret = raise(signal_received);

1816

} while(ret != 0 and errno == EINTR);

1817

if(ret != 0){

1818

perror("raise");

1819

abort();

1820

}

1821

TEMP_FAILURE_RETRY(pause());

1441

raise(signal_received);

1822

1442

}

1823

1443

1824

1444

return exitcode;